Update changelog

Author: Michele Mancioppi

CHANGELOG.md

@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1206](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1206))
 - Add psycopg2 native tags to sqlcommenter
   ([#1203](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1203))
+- Implement [`aws.ecs.*` resource attributes](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/semantic_conventions/cloud_provider/aws/ecs.md) in the `AwsEcsResourceDetector` detector
+  ([#1212](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1212))
 
 ### Added
 - `opentelemetry-instrumentation-redis` add support to instrument RedisCluster clients